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Wyświetlanie 1-15 z 25
Tytuł:
A Comparative Study on Boride Layer Morphology of Fe-4Co, Fe-4V and Fe-4W Binary Alloys
Autorzy:
Azakli, Y.
Gunduz, K.
Tarakci, M.
Gencer, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1401369.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Lp
81.05.Je
81.05.Bx
Opis:
In this study, the pack boronizing behavior of Fe-4M alloys (at.% M=W, V, Co) along with pure iron was investigated. The boronizing process was carried out at 1100°C for 3 h. The morphology, microstructure, boride layer thickness and surface properties of the formed boride layers were characterized by XRD, SEM-EDS and profilometry. The average boride layer thicknesses were 85 μm, 130 μm, 275 μm and 280 μm for Fe-4W, Fe-4V, Fe-4Co binary alloys and pure Fe, respectively. The surface roughness was not changed with the addition of alloying element into the substrate. FeB and Fe₂B phases exist on all boronized samples, but their ratio changes owing to alloying elements in the substrate. The saw-tooth morphology has transformed to a smoother boride layer with the addition of alloying elements of W and V, though Co addition was ineffective on saw tooth morphology. In addition, a transition zone under the boride layer was observed for the boronized Fe-W and Fe-V alloys. The formation of precipitates of boride of alloying elements was evident in the boride layer and in the transition zone for borided Fe-4V and Fe-4W alloys. Co has made a solid solution with iron in boride by replacing iron in the boride lattice.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1326-1330
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Modification of Micro-Alloy Steel Surfaces with Different Hard Materials Via Electro-Spark Deposition Method
Autorzy:
Çakir, A.
Yilmaz, M.
Ribalko, A.
Korkmaz, K.
Powiązania:
https://bibliotekanauki.pl/articles/1401438.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
82.45.Fk
81.65.Lp
Opis:
In this study, micro alloy steel (St 35) surfaces, which were coated with different hard alloy electrode materials via Electro Spark Deposition (ESD) method, have been characterized. The electrode materials were chosen among hard alloys such as; TiCN(Ni), CrC-NiCr, WC(Co) and TiWC(Co). During the ESD experiments, the following pulse parameters in a group were used: pulse current amplitude, pulse duration, electrical charge of 100-200 A, 100 μs, 1000 mC respectively. The surface roughness, thickness of coatings, cross sectional microstructure analysis, phase analysis, micro hardness and adhesion properties of the coated samples were characterized by profilometer, SEM (EDX), XRD, micro hardness tester and scratch adhesion tester respectively.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1410-1413
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Electrochemical Study of the Corrosion Resistance of Niobium-Aluminum Carbonitride Coating Produced on Steels by Thermo-Reactive Diffusion Technique
Autorzy:
Abakay, E.
Durmaz, M.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1031643.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Lp
81.65.Kn
87.64.Ee
Opis:
Thermo-reactive diffusion/deposition technique is an alternative to physical vapor deposition and chemical vapor deposition techniques for obtaining wear and corrosion resistant coatings on steel parts. In this work, thermo-reactive diffusion/deposition technique was used to produce niobium aluminum carbonitride-based coatings on AISI M2 steel. Characterization of the coatings was done by X-ray diffraction analysis, scanning electron microscopy and energy dispersive spectroscopy. The corrosion resistance of the produced coatings was investigated by using potentiodynamic polarization in a solution of 0.5 M NaCl. Hard, compact and adherent coatings, mainly consisting of NbC and NbN phases were obtained. The corrosion behavior of the samples was investigation by potentiodynamic polarization measurements.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 682-684
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changing Properties of Metal Surface Layers during Thermo-Chemical Treatment
Autorzy:
Wróblewski, G.
Skalski, K.
Piekarski, R.
Powiązania:
https://bibliotekanauki.pl/articles/2011035.pdf
Data publikacji:
1999-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Lp
81.65.Ya
Opis:
In this article a two-stage technology for constituting surface layers is proposed. First, the material is subjected to initial hardening by burnishing and next to a nitriding process. The surface layer after such processing should have considerably better strength properties compared to those created through a conventional nitriding process. A description of the state of the surface layer after these stages of the proposed process is obtained by defining suitable energy states for the materials. These states are expressed by residual strain and stress function and also by the functions of external work during the burnishing process and thermal energy given in the nitriding process. Methods of identifying the above functions through experimental research on the residual stress state and selected parameters of the surface layer, and also through numerical analysis of the coupled processes, are also proposed. The main part of the work consists in the mathematical description of complex deformation phenomena occurring in the material during the proposed process. In the given description, coupled stress fields appear as a result of the additivity of elastic, plastic, thermal, diffusional, and phase strains.
Źródło:
Acta Physica Polonica A; 1999, 96, 2; 311-317
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Fe-Nb-B Base Hardfacing of Steel
Autorzy:
Kilinc, B.
Cegil, O.
Abakay, E.
Sen, U.
Sen, S.
Powiązania:
https://bibliotekanauki.pl/articles/1311693.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Kn
68.55.J-
81.65.Lp
Opis:
Recently hardfacing by welding has become a commonly used technique for improvement of material performance in extreme (high temperature, impact/abrasion, erosion, etc.) conditions. In the present study, three different alloy compositions of the Fe-Nb-B were used for hardfacing of the AISI 1020 steel by tungsten inert gas welding process and analyzed. The coatings were produced from a mixture of ferrous niobium, ferrous boron and iron powders in the range of - 45 μm particle size with different ratio. The coatings' thickness was set to 2-3 mm on the substrate. Microstructure, phase analysis and hardness of the manufactured hardfacing alloys were characterized. Deposition results indicate good quality thick coating and porosity free of the hardfacings. X-ray diffraction analyses showed that the alloyed layers include iron borides, FeNbB and iron phases. It was shown that surface alloyed layer has composite structure including steel matrix and well distributed boride phases.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 656-658
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Behavior of Nitride and Cr-Al-N Coatings Formed on AISI D2 Steel
Autorzy:
Kılınc, B.
Demirkiran, S.
Sen, U.
Sen, S.
Powiązania:
https://bibliotekanauki.pl/articles/1399749.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Kn
68.55.J-
81.65.Lp
Opis:
In the present work, the corrosion behavior of Cr-Al-N coating formed on the pre-nitrided AISI D2 cold work tool steel by thermo-reactive diffusion technique in the powder mixture consisting of ferro-chromium, aluminum, ammonium chloride and alumina at 1000C for 2 h was investigated. The phases formed in the coating layers were $Cr_2N$, $(Cr,Fe)_2N_{1-x}$, $AlN$, and $Fe_2N$ which were confirmed by X-ray diffraction analysis. The uncoated, nitrided, and Cr-Al-N coated specimens were placed in corrosive media (3.5 wt% salt solution). A standard saturated calomel electrode was used as a reference and graphite as a counter or auxiliary electrode. The effectiveness of the coatings in preventing corrosion was tested in the NaCl solution by electrochemical impedance studies using the Nyquist plots and potentiodynamic studies as well. Conclusively, the application of nitride and Cr-Al-N layers on AISI D2 steel increased its surface hardness and corrosion resistance. The corrosion resistance of Cr-Al-N coatings is higher than that of uncoated and nitrided steels.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 268-270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of Shallow Dislocations on 4H-SiC Substrate by Etching Method
Autorzy:
Ishikawa, Y.
Yao, Y.
Sato, K.
Sugawara, Y.
Danno, K.
Suzuki, H.
Bessho, T.
Kawai, Y.
Shibata, N.
Powiązania:
https://bibliotekanauki.pl/articles/1492539.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.uj
81.65.Cf
68.37.Lp
Opis:
Correlation between dislocation types in epitaxial 4H-SiC and etch pit types on the 4H-SiC wafer surface were investigated by etch pit method and transmission electron microscope. Shallow dislocation on the wafer was found to form round pit without core. The shallow dislocation was estimated half-loop type in wafer and this estimation explains that step-flow growth converts half-loop dislocation into complex dislocation composed by threading dislocation and basal plane dislocation.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-025-A-027
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Double Stage Nitriding on 34CrAlNi7-10 Nitriding Steel
Autorzy:
Altinsoy, İ.
Çelebı Efe, G.
Yener, T.
Önder, K.
Bindal, C.
Powiązania:
https://bibliotekanauki.pl/articles/1031228.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.BX
81.65.LP
81.70.BT
Opis:
In this study, effect of double stage gas nitriding of 34CrAlNi7-10 steel was analyzed. Nitriding processes were carried out in two stages. in the first stage, samples were nitridied at 500°C for 10 h and then in second stage nitriding process was continued at 530 and 550°C for 20 h. During both stages, the nitrogen activity on surface was controlled by the nitriding potential, which is a thermodynamical control parameter for controlled gas nitriding process. The nitriding potential was kept constant, at value of 10, during the first stage and was varied in the range of 3.2-0.2, for both nitriding temperatures, in the second stage. The presence of nitrides, formed on the surface of test materials was determined by XRD analysis technique. The morphology of nitrided layer was studied by optical microscopy. The microhardness of the surfaces of nitrided samples in HV1 was between 955 and 1029. The measurements have shown that the thickness of the compound layer (white layer) has varied between 6.85-23.90 μm and that the growth of the white layer and microhardness gradient were strongly affected by the nitriding potential and the temperature. Diffusion depths as Nht(HV) for Vickers Hardness were determined and compared.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 663-666
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Heat Treatment and Pulse Plasma Process on Surface Properties of Steels
Autorzy:
Özbek, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1032518.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Lp
Opis:
The aim of this study was to examine the effect of heat treatment and pulse plasma treatment on surface properties of AISI 1050 steel used in this work. Firstly, the heat treatment was applied to samples for 2 h at 860°C. The quenching media were selected as water and oil and air cooling was applied. The tempering process was applied at different temperatures like 600°C, 500°C, 400°C and 100°C. Having completed the heat treatment, the pulse plasma process was applied to all samples. The surfaces were investigated with optic microscope, scanning electron microscopy, and X-ray diffraction analyses. The hardness testing was done for all samples from surface to center. The mechanical properties were improved after pulse plasma treatment.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 182-185
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the Silanization Processes on the Properties οf Oxidized Multiwalled Carbon Nanotubes
Autorzy:
Scheibe, B.
Borowiak-Palen, E.
Kalenczuk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1807640.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Mq
81.07.De
61.48.De
65.80.-g
68.37.Lp
Opis:
This paper presents the results of the research on the effect of the two different silanization methods on the thermal and structural properties of oxidized multiwalled carbon nanotubes. As-purified material was oxidized in the mixture of nitric and sulfuric acids. An oxidized material was divided into two parts which underwent two silanization treatments by 3-aminopropyltriethoxysilane (APTES). The first experiment (I) was performed at room temperature in acetone (pH 7) for 30 min. The second experiment (II) involved a hydrolysis of APTES at 40°C in water (pH 4) for 3 h. The functionalization extent of the samples at each step of the preparation was investigated by the Raman spectroscopy. The presence of the functional groups on the nanotubes surface have been studied via the Fourier transform infrared spectroscopy (FT-IR). The quantity of the external moieties introduced on multiwalled carbon nanotubes surface after oxidation process was estimated by the Boehms titration method. The high resolution transmission electron microscopy analysis allowed us to observe the changes of the morphology of the investigated carbon nanotubes. The influence of the silanization processes on the thermal stability of multiwalled carbon nanotubes was thoroughly studied by thermogravimetry analysis. There was observed a significant increase of the thermal stability of the multiwalled carbon nanotubes samples upon silanization treatment in respect of pristine and oxidized multiwalled carbon nanotubes.
Źródło:
Acta Physica Polonica A; 2009, 116, S; S-150-S-155
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas Nitriding Behaviour of 34CrAlNi7 Nitriding Steel
Autorzy:
Altinsoy, I.
Onder, K.
Celebi Efe, F.
Bindal, C.
Powiązania:
https://bibliotekanauki.pl/articles/1219733.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.65.Lp
Opis:
In this study, gas nitriding behavior of 34CrAlNi7-10 steel was investigated. Single stage processes were carried out at 500°C, 520C and 540C for 10, 20, 30 h, respectively. Nitrogen activity on surface was controlled by the nitriding potential $K_{N}$ which is known as thermodynamical control parameter for controlled gas nitriding process. The presence of nitrides formed on surface of test material was determined by X-ray diffraction analysis technique. The morphology of nitrided layer was studied by optical microscope. The microhardness of surface of nitrided sample in $HV_1$ was observed between 975 and 1132. Choosing the right nitriding potentials for each temperature, which give the same nitrogen concentration and activity on surface by using the Lehrer diagram, showed that all the samples had almost the same surface roughness of $R_{a}$ = 0.28-0.32 μm after gas nitriding cycles. The measurements showed that the white layer thickness varies between 4.38 μm and 28.80 μm and the growth of the layer was strongly affected by process time and temperature. Diffusion depths as Nht (HV) for each experiment were determined and compared.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 414-416
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of Surface Properties of Low Carbon Steel by Nitriding Treatment
Autorzy:
Benlahreche, F.
Nouicer, E.
Powiązania:
https://bibliotekanauki.pl/articles/1030365.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Lp
Opis:
This work aimed to improve the physicochemical properties of a low carbon steel C15 by a nitriding treatment in a salt bath at 580°C. The micrographs of treated sample show that the nitriding treatment causes significant structural changes, it is allowed to delineate the nitriding layer. The X-ray diffraction and the Raman spectroscopy of the treated samples permitted to identify different nitrides (Fe_{2-3}N, Fe₄N) formed. The obtained hardness profile determines the nitriding depth. Potentiodynamic curves show that the corrosion current density of treated C15 is the 10 times lower than untreated specimen. The values of impedance parameters obtained after nitriding treatment indicate that the resistance values and exponent n increase, whereas the capacitance decreases. We concluded that the nitriding treatment is an effective method for improvement of the corrosion behavior and surface properties of the low alloy steel C15.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 20-23
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure Development in Multilayer $TiB_x // TiSi_y C_z$ Coatings during Post-Deposition Heat Treatment
Autorzy:
Twardowska, A.
Rajchel, B.
Morgiel, J.
Mędala-Wójcik, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398372.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Cd
81.20.-n
42.62.-b
61.43.Dq
68.37.-d
68.37.Lp
68.65.Ac
64.70.Kb
Opis:
Multilayer amorphous $TiB_{x} // TiSi_{y}C_{z}$ coatings were formed by duplex treatment: dual beam ion beam assisted deposition and pulsed laser deposition. Post-deposition heating was applied to activate crystallization in the coating. In situ transmission electron microscopy heating experiments were conducted in the temperature range 20-600°C. Crystallization of TiB₂ phase in $TiB_{x}$ layers begun at 450°C, while $TiSi_{y}C_{z}$ layers retained nearly amorphous up to 600°C.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1124-1126
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphology and Selected Properties of Core/Shell ZnTe-Based Nanowire Structures Containing ZnO
Autorzy:
Gas, K.
Janik, E.
Zaleszczyk, W.
Pasternak, I.
Dynowska, E.
Fronc, K.
Kolkovsky, V.
Kret, S.
Morhange, J. F.
Reszka, A.
Wiater, M.
Caliebe, W.
Karczewski, G.
Kowalski, B. J.
Szuszkiewicz, W.
Wojtowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/2047950.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
68.37.Lp
68.65.La
81.07.Vb
Opis:
We report on an approach to fabricate ZnTe-based core/shell radial heterostructures containing ZnO, as well as on some of their physical properties. The molecular beam epitaxy grown ZnTe nanowires constituted the core of the investigated structures and the ZnO shells were obtained by thermal oxidation of ZnTe NWs. The influence of the parameters characterizing the oxidation process on selected properties of core/shell NWs were examined. Scanning electron microscopy revealed changes of the NWs morphology for various conditions of the oxidation process. X-ray diffraction, high resolution transmission electron microscopy, and Raman scattering measurements were applied to reveal the presence of ZnTe single crystal core and polycrystalline ZnO-shell of investigated structure.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 612-614
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pack Siliconizing of Ti6Al4V Alloy
Autorzy:
Celebi Efe, G.
İpek, M.
Bindal, C.
Zeytin, S.
Powiązania:
https://bibliotekanauki.pl/articles/1031464.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Lp
81.65.-b
Opis:
In this study, it was aimed to produce titanium silicide layer on Ti6Al4V by a simple, cheap and efficient method of pack siliconizing. Siliconizing was performed in a pack containing a mixture composed of SiO₂ powder as siliconizing source, pure Al powder as a reducer for siliconizing, NH₄Cl as an activator and Al₂O₃ powder as filler, at 1000°C for 8, 10 and 12 hours in open atmospheric furnace. Optical microscope and SEM-EDS studies indicate that the morphology of silicide layers has smooth, dense and layered nature. The presence of phases, confirmed by XRD analyses, reveals that the silicide layers formed at 1000°C are composed of TiSi₂, Ti₃Si₅, TiN, TiO₂ and SiO₂ compounds. Silicide layer thickness was increased with increasing process time and ranged from 7.5 to 9.0 μm. Hardness of silicide layers, measured by Vickers indentation, is over 2100 HV.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 760-762
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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